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I actually ended up with this set. It turned out to be a very nasty short circuit on the audio board. To trouble shoot disconnect PSD5 to isolate the power supply. It's the 3rd connector from the back on the left side of the power supply. If you turn on the tv and now see 5 green leds and the one red led, look for a short outside of the power supply. The short on this set was on the left side of the audio board (which is to the left of the power supply) There was a wire add and a part add covered in wax. The bare wire was touching a ground but you have to remove the wax to see it. Since this may be a change that was made to all sets of this model, it may be a common failure. Good Luck all.
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Make sure that the coolant is not leaking out onto the printed circuit boards. i have had the remote sensor cause this problem before and also I have had bad capacitors in the sweep and the main power supplies. Good Luck